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Ian S. Katznelson, MD

4.9

1735 ratings Read Reviews

Northwestern Medical Group

Primary Specialty

Neurology

Secondary Specialty

Sleep Medicine

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Reasons to Schedule a Visit

This medical professional may be a good choice for you if you are looking for care for any of the following:

Circadian rhythm disorder
Cpap evaluation
Cpap related anxiety
Daytime sleepiness
Hynagogic hallucinations
Hypersomnia
Insomnia
Narcolepsy
Night terror

Nightmares
Parasomnia
Rem behavior disorder
Restless leg syndrome
Sleep apnea
Sleep paralysis
Sleepwalking
Snoring

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Education

Medical Education:: MD, Northwestern University Feinberg School of Medicine - 1998
Internship:: McGaw Medical Center of Northwestern University - 1999
Residency:: Washington University/B-JH/SLCH Consortium - 2002
Fellowships:: Rush University Medical Center - 2003

Board Certifications

American Board of Psychiatry and Neurology/Clinical Neurophysiology - Clinical Neurophysiology (Certified)
American Board of Psychiatry and Neurology/Neurology - Neurology (Certified)
American Board of Psychiatry and Neurology/Sleep Medicine - Sleep Medicine (Certified)

Faculty Profile

Clinical Assistant Professor, Feinberg School of Medicine

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Practice Groups and Affiliations

Medical Group:: Northwestern Medical Group
Alignment Category:: Northwestern Medicine Physician Network
On Medical Staff At:: Catherine Gratz Griffin Lake Forest Hospital

Ratings and Reviews

At Northwestern Medicine, our patient’s feedback is important to us. While different care providers have their own unique strengths, we strive to be as transparent as possible with our quality of care.

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Overall Rating

4.9

4.9

1735 Ratings

Reviews from Patients

100 Most Recent Reviews

Reviews from Patients

100 Most Recent Reviews

February 27, 2026

5.0

Personable

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February 27, 2026

5.0

Explains things very well. Looks to find the root causes to help improve my health.

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February 26, 2026

5.0

One of the best doctors that I have been to.

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February 23, 2026

5.0

Knowledgeable and friendly.

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February 20, 2026

5.0

Personable and thorough in evaluating health concerns.

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February 19, 2026

5.0

Very likeable Doctor! Explains what he is doing and take his time with you!

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February 12, 2026

5.0

Thoroughly collected all relevant information and was comprehensive in explaining things in easy to understand terminology

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February 11, 2026

5.0

He's the best. Helped me achieve max sleep relief

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February 10, 2026

5.0

Very honest communication and knowledgeable.

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February 10, 2026

5.0

Very knowledgeable and thorough

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February 03, 2026

5.0

Dr. Katznelson is very knowledgeable and personable and is willing to take the time necessary to answer all your questions.

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January 31, 2026

5.0

Excellent Service!

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January 30, 2026

5.0

Dr. Katznelson is always wonderful, but yesterday 1/29 I saw Jennifer.

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January 29, 2026

5.0

Competent, caring and spends time answering questions

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January 28, 2026

5.0

Compassionate, thorough, attentive, polite

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January 20, 2026

5.0

He is also patient and understanding of my concerns. He plays it safe while also avoiding unnecessary tests, etc. and costs.

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January 17, 2026

5.0

Great Doctor Katznelson!

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January 16, 2026

5.0

Makes you feel comfortable and listens to what I said about all the symptoms that I'm having

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January 16, 2026

5.0

Excellent and considerate cae

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January 15, 2026

5.0

He spent time listening to my issues and concerns.

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January 14, 2026

5.0

Caring, takes time to discuss and explain options. Good listener

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January 13, 2026

5.0

Outstanding

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January 12, 2026

5.0

I don't know if I'd be in an actual situation to recommend a hospital or particular doctor to someone, which is the only reason for a 9 instead of a 10. If the situation came up, I would indeed recommend

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January 11, 2026

5.0

Thorough, listens, and very caring. Wants to always make sure he gives best care

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January 10, 2026

5.0

Makes eye contact when he talks to you. Explains rationale for what he is doing.

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January 09, 2026

5.0

He's very well, educated and knowledgeable on what's going on

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January 07, 2026

5.0

I like his manner.

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January 06, 2026

5.0

Dr. Katznelson is kind and thorough and takes patient concerns seriously. I can sense his genuine care to get to the bottom of my concerns and I feel reassured that he is monitoring my health and that I'm under his care.

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January 05, 2026

5.0

Listening skill GREAT. really cares about you and thorough in trying to get to heart of issues. Highly recommend

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January 05, 2026

5.0

Professional and understanding

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January 04, 2026

5.0

He's extremely thorough and knowledgeable.

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January 04, 2026

5.0

Clear concise professional

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December 25, 2025

5.0

Kind, intelligent, takes a lot of time, patient

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December 16, 2025

5.0

I really like Dr Katznelson as my doctor. He went out of his way to make my visit great. He was very thorough and knowledgeable about my medical condition. I would highly recommend him to anyone.

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December 15, 2025

5.0

He is a caring Dr and listens when his patients have questions. He will not over perscribe meds.

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December 10, 2025

5.0

Thorough, good bedside manner, good explanation of plan of care.

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December 08, 2025

5.0

He's great. Knowledgeable, personable, provides evidence-based answers to questions.

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December 08, 2025

5.0

I was very impressed by the fact that Dr. Katznelson had thoroughly reviewed my medical history and was well prepared for this first appointment. I look foward to working with Dr. Katznelson to address my medical issue.

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December 06, 2025

5.0

I waited 8 months for an initial appointment with Dr. Katznelson and it was worth the wait. He took his time to address my concerns and thoroughly talked through next steps. I was treated like a human, not a number, and left my appointment feeling confident about finding resolution to my nagging migraines.

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December 02, 2025

5.0

Dr Katznelson was evidently very competent, and spent time carefully listening to my problems. Very kind person. Set up a plan going forward, very happy with experience.

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November 25, 2025

5.0

I felt cared for and respected throughout the visit.

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November 18, 2025

5.0

Extremely knowledgeable and a reassuring manner.

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November 12, 2025

5.0

Dr Katznelson is outstanding!!!!!

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November 11, 2025

5.0

He was very kind & easy to talk to.

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November 11, 2025

5.0

Knowledgeable. Listens. Answers questions.

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November 11, 2025

5.0

Great listener, thorough, knowledgeable

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November 07, 2025

5.0

An excellent neurologist. He spends the right amount of time to get to know you and your issues.

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November 04, 2025

5.0

Very thorough with the yearly exam and explains everything so I could understand.

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November 04, 2025

5.0

Knowledgeable, concerned

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November 03, 2025

5.0

I trust him

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November 03, 2025

5.0

He is a Great Doctor.

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October 31, 2025

5.0

Thorough and professional

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October 29, 2025

5.0

Very thorough

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October 26, 2025

5.0

He gives me good information. He's a good listener.

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October 22, 2025

5.0

Efficient and thorough

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October 21, 2025

5.0

He listens carefully and answers all of my questions thoughtfully. I truly feel he has my best interests in mind. He has taken very good care of me .

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October 21, 2025

5.0

Because Dr. is very thorough in what he's looking at ,so hoping for a good outcome

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October 18, 2025

5.0

Very customer focused

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October 15, 2025

5.0

He is the best doctor.

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October 15, 2025

5.0

Listens and caring

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October 15, 2025

5.0

Dr. Katznelson is professional, thorough, educational and has an effective way of communicating while listening.

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October 14, 2025

5.0

Dr Katznelson is very clear on explaining things. Asks important questions. A true advocate.

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October 14, 2025

5.0

thorough and quality visits with extensive testing

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October 14, 2025

5.0

Takes the time to listen to you And also conservative in protocol for patient

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October 07, 2025

5.0

great experience from the stuff to the doctor very friendly,explained to me step by step,during the visit.

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October 06, 2025

5.0

Dr Katznelson is thorough and knowledgeable.

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October 05, 2025

5.0

Dr. Katznelson is a good listener and a very good clinician.

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October 04, 2025

5.0

Competent, listens and responds to messages through pirtal

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October 03, 2025

5.0

He is involved and knows what he is talking about and genuinely cares.

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September 30, 2025

5.0

He very caring and he able to articulate what the issues are and comes up with a plan.

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September 30, 2025

5.0

Knowledgeable doctor. Easy to talk too. Answers my questions and explains in detail why he is recommending a certain test or medication. Always gets back to me on my chart.

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September 30, 2025

5.0

Answered all my concerns

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September 29, 2025

5.0

Again, he's very nice and thorough.

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September 24, 2025

5.0

He goes ABOVE & BEYOND to find out the CAUSE of your illness/symptoms.

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September 21, 2025

5.0

Dr Ian S. Katznelson is very good doctor.

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September 17, 2025

5.0

Careful, detail- oriented, personable

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September 16, 2025

5.0

Provides excellent care. Always helping and available to answer questions.

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September 14, 2025

5.0

He always looks out for the best treatment for me. I trust his judgment because I know he cares. Very intelligent, thoughtful and he monitors my situation. I'm am so lucky to have him for my Doctor. He answers every question I have and he makes sure I understand everything before I leave the office.

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September 12, 2025

5.0

He is caring and easy to talk to

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September 09, 2025

5.0

Great doctor

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September 08, 2025

5.0

Knowledgeable, and seems as he wants the best care for me

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September 08, 2025

5.0

Dr. Ian Katznelson was very attentive and interested in helping find solutions to my health issues!

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September 04, 2025

5.0

Good listener and he made an effort to speak Spanish with mom.

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September 03, 2025

5.0

He is very thorough and focused in patient meetings. Easy to communicate with and insures that the patient fully understands the issues discussed.

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August 29, 2025

5.0

I had a good initial visit with him. He was very professional, personable and informative. I've no negative comments.

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August 19, 2025

5.0

I wud recommend Dr. Katznelson.

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August 14, 2025

5.0

Dr Katznelson was very thorough and very pleasant.

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August 08, 2025

5.0

He is a thorough neurologist

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August 07, 2025

5.0

Service was great

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August 07, 2025

5.0

He is so kind and patient and knowledgeable about things. He is an amazing human.

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August 05, 2025

5.0

Again because he is the best

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August 04, 2025

5.0

He's the best.

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August 04, 2025

5.0

Doctor KatzNelson it's a really nice doctor took the time to explain the options for my treatment!

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August 02, 2025

5.0

Explains things well and very personable

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August 02, 2025

5.0

Nice person. Great energy.

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July 30, 2025

5.0

He is kind, thorough, patient and really listens and cares.

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July 30, 2025

5.0

He has always been thorough, patient, and takes his time when explaining and with my questions. He genuinely cares and helps when further tests are needed or referrals to other doctors/specialists

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July 30, 2025

5.0

Dr Katznelson is thorough and excellent at looking at the whole picture of my health . I trust him explicitly

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July 29, 2025

5.0

Always a pleasure and he makes sense, listens well, and goes over our history beforehand. Very professional and honest!

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July 29, 2025

5.0

He is extremely thorough

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Disclosures

Faculty member received compensation for medical record consultation and/or expert witness testimony.

External Professional Relationships

Pharmaceutical, device, and biotechnology companies frequently collaborate with basic scientists and physicians within an academic medical center to help advance science and improve patient care. These relationships are important in achieving scientific breakthroughs and in establishing the effectiveness and safety of promising new therapies. In order to assure objectivity in clinical research and patient care, the Northwestern University Feinberg School of Medicine (Feinberg), Northwestern Memorial HealthCare, Children's Hospital of Chicago Medical Center, and the Shirley Ryan AbilityLab have adopted integrity policies that require research and clinical faculty (in full-time, part-time, and unpaid/voluntary categories) to report compensated and uncompensated external industry relationships. Patients are encouraged to discuss these disclosures with their physician as well as to inquire as to how these relationships are overseen by Feinberg. To learn more about our Disclosure and Professional Integrity Policy, and the conflict of interest policies of our joint affiliate survey partners, please go to our Office for Regulatory Affairs Policies page.

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HealthBeat

Eats to Help You Sleep

Nature’s nightcaps.

Why Do I Feel Tired Mid-Afternoon?

Learn from a neurologist.

More HealthBeat Articles